On Wed, 17 Aug 2011 23:50:53 -0700
Greg Thelen [off-list ref] wrote:

Both mem_cgroup_charge_statistics() and mem_cgroup_move_account() were
unnecessarily disabling preemption when adjusting per-cpu counters:
    preempt_disable()
    __this_cpu_xxx()
    __this_cpu_yyy()
    preempt_enable()

This change does not disable preemption and thus CPU switch is possible
within these routines.  This does not cause a problem because the total
of all cpu counters is summed when reporting stats.  Now both
mem_cgroup_charge_statistics() and mem_cgroup_move_account() look like:
    this_cpu_xxx()
    this_cpu_yyy()

Reported-by: KAMEZAWA Hiroyuki <redacted>
Signed-off-by: Greg Thelen <redacted>

Thank you.
Acked-by: KAMEZAWA Hiroyuki <redacted>

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